Classicism, in the arts, refers generally to a high regard for a classical period, classical antiquity in the Western tradition, as setting standards for taste which the classicists seek to emulate. The art of classicism typically seeks to be formal and restrained: of the DiscobolusSir Kenneth Clark observed, "if we object to his restraint and compression we are simply objecting to the classicism of classic art. A violent emphasis or a sudden acceleration of rhythmic movement would have destroyed those qualities of balance and completeness through which it retained until the present century its position of authority in the restricted repertoire of visual images."[1] Classicism, as Clark noted, implies a canon of widely accepted ideal forms, whether in the Western canon that he was examining in The Nude (1956), or the literary Chinese classics or Chinese art, where the revival of classic styles is also recurring feature.

Classicism is a force which is often present in post-medieval European and European influenced traditions; however, some periods felt themselves more connected to the classical ideals than others, particularly the Age of Enlightenment.

Classicism is a specific genre of philosophy, expressing itself in literature, architecture, art, and music, which has Ancient Greek and Roman sources and an emphasis on society. It was particularly expressed in the Neoclassicism of the Age of Enlightenment.

Classicism was a recurrent tendency in the Late Antique period, and had a major revival in Carolingian and Ottonian art. There was another, more durable revival in the Italian renaissance when the fall of Byzantium and rising trade with the Islamic cultures brought a flood of knowledge about, and from, the antiquity of Europe. Until that time the identification with antiquity had been seen as a continuous history of Christendom from the conversion of Roman Emperor Constantine I. Renaissance classicism introduced a host of elements into European culture, including the application of mathematics and empiricism into art, humanism, literary and depictive realism, and formalism. Importantly it also introduced Polytheism, or "paganism", and the juxtaposition of ancient and modern.

The classicism of the Renaissance led to, and gave way to, a different sense of what was "classical" in the 16th and 17th centuries. In this period classicism took on more overtly structural overtones of orderliness, predictability, the use of geometry and grids, the importance of rigorous discipline and pedagogy, as well as the formation of schools of art and music. The court of Louis XIV was seen as the center of this form of classicism, with its references to the gods of Olympus as a symbolic prop for absolutism, its adherence to axiomatic and deductive reasoning, and its love of order and predictability.

This period sought the revival of classical art forms, including Greek drama and music. Opera, in its modern European form, had its roots in attempts to recreate the combination of singing and dancing with theatre thought to be the Greek norm. Examples of this appeal to classicism included Dante, Petrarch, and Shakespeare in poetry and theatre. Tudor drama, in particular, modeled itself after classical ideals and divided works into Tragedy and Comedy. Studying Ancient Greek became regarded as essential for a well-rounded education in the liberal arts.

The Renaissance also explicitly returned to architectural models and techniques associated with Greek and Roman antiquity, including the golden rectangle as a key proportion for buildings, the classical orders of columns, as well as a host of ornament and detail associated with Greek and Roman architecture. They also began reviving plastic arts such as bronze casting for sculpture, and used the classical naturalism as the foundation of drawing, painting and sculpture.

The Age of Enlightenment identified itself with a vision of antiquity which, while continuous with the classicism of the previous century, was shaken by the physics of Sir Isaac Newton, the improvements in machinery and measurement, and a sense of liberation which they saw as being present in the Greek civilization, particularly in its struggles against the Persian Empire. The ornate, organic, and complexly integrated forms of the baroque were to give way to a series of movements that regarded themselves expressly as "classical" or "neo-classical", or would rapidly be labelled as such. For example the painting of Jacques-Louis David which was seen as an attempt to return to formal balance, clarity, manliness, and vigor in art.

The 19th century saw the classical age as being the precursor of academicism, including such movements as uniformitarianism in the sciences, and the creation of rigorous categories in artistic fields. Various movements of the romantic period saw themselves as classical revolts against a prevailing trend of emotionalism and irregularity, for example the Pre-Raphaelites. By this point classicism was old enough that previous classical movements received revivals; for example, the Renaissance was seen as a means to combine the organic medieval with the orderly classical. The 19th century continued or extended many classical programs in the sciences, most notably the Newtonian program to account for the movement of energy between bodies by means of exchange of mechanical and thermal energy.

The 20th century saw a number of changes in the arts and sciences. Classicism was used both by those who rejected, or saw as temporary, transfigurations in the political, scientific, and social world and by those who embraced the changes as a means to overthrow the perceived weight of the 19th century. Thus, both pre-20th century disciplines were labelled "classical" and modern movements in art which saw themselves as aligned with light, space, sparseness of texture, and formal coherence.

In the present day philosophy classicism is used as a term particularly in relation to Apollonian over Dionysian impulses in society and art; that is a preference for rationality, or at least rationally guided catharsis, over emotionalism.

Unity of time referred to the need for the entire action of the play to take place in a fictional 24-hour period

Unity of place meant that the action should unfold in a single location

Unity of action meant that the play should be constructed around a single 'plot-line', such as a tragic love affair or a conflict between honour and duty.

Examples of classicist playwrights are Pierre Corneille, Jean Racine and Moliere. In the period of Romanticism, Shakespeare, who conformed to none of the classical rules, became the focus of French argument over them, in which the Romantics eventually triumphed; Victor Hugo was among the first French playwrights to break these conventions.

The influence of these French rules on playwrights in other nations is debatable. In the English theatre, Restoration playwrights such as William Wycherly and William Congreve would have been familiar with them. William Shakespeare and his contemporaries did not follow this Classicist philosophy, in particular since they were not French and also because they wrote several decades prior to their establishment. Those of Shakespeare's plays that seem to display the unities, such as The Tempest, probably indicate a familiarity with actual models from classical antiquity.

Orderly arrangements of columns, pilasters and lintels, as well as the use of semicircular arches, hemispherical domes, niches and aedicules replaced the more complex proportional systems and irregular profiles of medieval buildings. This style quickly spread to other Italian cities and then to France, Germany, England, Russia and elsewhere.